MCQOPTIONS
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MCQOPTIONS
This section includes 80 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The S.I unit of pressure is? |
| A. | 8.5 pounds |
| B. | Nm2 |
| C. | Torr |
| D. | mm Hg |
| Answer» C. Torr | |
| 2. |
How many scales of thermometer are there? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | At least five |
| Answer» D. At least five | |
| 3. |
The collision of molecules of gases at reduced volume causes? |
| A. | Lower pressure |
| B. | medium pressure |
| C. | Higher pressure |
| D. | No effect on pressure |
| Answer» D. No effect on pressure | |
| 4. |
Normal temperature and pressure (S.T.P) of gases refer to? |
| A. | 273 °C and 760 mm Hg. |
| B. | 273 °C and 76 mm Hg. |
| C. | 273 K and 76 mm Hg |
| D. | 273 K and 760 mm Hg |
| Answer» E. | |
| 5. |
Which of the following is false for gases? |
| A. | They do not mix well |
| B. | They diffuse easily |
| C. | They have mass |
| D. | They are highly compressible |
| Answer» B. They diffuse easily | |
| 6. |
A graph plotted by Boyle's Law is? |
| A. | A curve with minimum |
| B. | A curve with maximum |
| C. | A straight line |
| D. | A parabolic curve |
| Answer» E. | |
| 7. |
The gas law giving relationship between volume and pressure of gas? |
| A. | Graham's Law |
| B. | Charle's Law |
| C. | Dalton's Law |
| D. | Boyle's Law |
| Answer» E. | |
| 8. |
Mathematically Boyle's Law is shown as? |
| A. | PT = K |
| B. | PT = K |
| C. | P V = K |
| D. | VT = K |
| Answer» D. VT = K | |
| 9. |
The value of the general gas constant R in SI units is? |
| A. | 0.0821 dm atm. K-1 mol-1 |
| B. | 8.3143 J.K. mol-1 |
| C. | 8.3143 Kj. K* mol-1 |
| D. | 64 dm torr. K-1, mol- |
| Answer» C. 8.3143 Kj. K* mol-1 | |
| 10. |
If a graph is plotted between temperature on x-axis and volume of the one mole of gas on V-axis at constant pressure, than a straight line Is obtained which cuts a temperature axis at? |
| A. | 0°C |
| B. | —2716°C |
| C. | 300 K |
| D. | —2716 K |
| Answer» C. 300 K | |
| 11. |
Nitrogen and Ethene (C2H4) have the same rates of diffusion at a fixed temperature because? |
| A. | Both have multiple bonds in them |
| B. | Both are electrically neutral molecules |
| C. | Both are covalent compounds |
| D. | Their molecular masses are same |
| Answer» E. | |
| 12. |
When two gases of same molecular masses are present at constant temperature and pressure, which of the following statement is true about the two gases? |
| A. | They posses same Kinetic energy |
| B. | The have same rate of diffusion |
| C. | They have same boiling points |
| D. | All of the above are correct |
| Answer» C. They have same boiling points | |
| 13. |
The Law which applies most commonly to the cases of a gas collected over water, is? |
| A. | Dalton's Law |
| B. | Charles Law |
| C. | Graham's Law |
| D. | Avogadro's Law |
| Answer» B. Charles Law | |
| 14. |
The general gas equation is represented as? |
| A. | PV = nRT |
| B. | R = PVnT |
| C. | V = nRTP |
| D. | T= PV/nR |
| Answer» B. R = PVnT | |
| 15. |
The density of methane (CH4) at 2 atm pressure and 27°C is? |
| A. | 0.012 gm/dm3 |
| B. | 154 gm/dm3 |
| C. | 7 gm/dm3 |
| D. | 3 gm/dm3 |
| Answer» E. | |
| 16. |
Two gases Helium & Sulphur dioxide are enclosed in a porous vessel. The comparison of diffusion rates will be? |
| A. | He diffuses 16 times faster than SO2 |
| B. | He diffuses 4 times faster than SO |
| C. | SO2 diffuses 16 times faster than He. |
| D. | SO2 diffuses 4 times faster than |
| Answer» C. SO2 diffuses 16 times faster than He. | |
| 17. |
The formula used to calculate Partial pressure of a gas is? |
| A. | P(gas) = P X n(gas) / n(Total) |
| B. | P(gas) = n(gas) X n(Total) / P |
| C. | P(gas) = P X n(Total) / n(gas) |
| D. | P(gas) = P X n(gas) X n(Total) |
| Answer» B. P(gas) = n(gas) X n(Total) / P | |
| 18. |
The rate of diffusion of hydrogen gas is three times faster than that of X gas at same temperature and pressure, the molecular mass of gas X is? |
| A. | 6 |
| B. | 18 |
| C. | 16 |
| D. | 2 |
| Answer» C. 16 | |
| 19. |
The rate of diffusion of a gas is inversely proportional to the square root of the density of that gas. This is that statement of? |
| A. | Dalton's Law |
| B. | Boyle's Law |
| C. | Graham's Law |
| D. | Charle's Law |
| Answer» D. Charle's Law | |
| 20. |
Which of the following gas diffuse most rapidly? |
| A. | N2 |
| B. | H2 |
| C. | CH4 |
| D. | He |
| Answer» C. CH4 | |
| 21. |
The volume of a given mass of a gas directly proportional to the absolute temperature at a given pressure, is the statement of? |
| A. | Dalton's Law |
| B. | Boyle's Law |
| C. | Charle's Law |
| D. | Graham's Law |
| Answer» D. Graham's Law | |
| 22. |
1 dm3 of 02 is equal to? |
| A. | l6gm |
| B. | 32gm |
| C. | 2gm |
| D. | 43gm |
| Answer» E. | |
| 23. |
The mass of 24 dm3 of SO3 of S.T.P is equal to? |
| A. | 80gm |
| B. | 24gm |
| C. | 4Ogm |
| D. | 64gm |
| Answer» B. 24gm | |
| 24. |
The relationship between the volume and the number of molecular mass was explained by? |
| A. | Robert Boyle |
| B. | John Dalton |
| C. | Amadeo Avogadro |
| D. | Jacques Charles |
| Answer» D. Jacques Charles | |
| 25. |
At constant pressure, the decreased velocity, causes the sample of a gas to? |
| A. | Expand |
| B. | Shrink |
| C. | Remains same |
| Answer» C. Remains same | |
| 26. |
Charle's Law can be represented Mathematically as? |
| A. | PV = K |
| B. | P/V = K |
| C. | VT = K |
| D. | V/T = K |
| Answer» E. | |
| 27. |
The mass of 24 dm3 of N2 is? |
| A. | 2gm |
| B. | 44 gm |
| C. | 28gm |
| D. | 32 gm |
| Answer» D. 32 gm | |
| 28. |
A decrease in temperature, _____ the average Kinetic energy of the gas molecules. |
| A. | Increases |
| B. | Does not effect |
| C. | Decreases |
| Answer» D. | |
| 29. |
Volume of a gas is directly proportional to the number of molecules when? |
| A. | Temperature & pressure is constant. |
| B. | Pressure is constant |
| C. | None of the above |
| D. | Temperature is constant. |
| Answer» B. Pressure is constant | |
| 30. |
The temperature that refer absolute zero is? |
| A. | 273 K |
| B. | O K |
| C. | —2716 K |
| D. | 273°C |
| Answer» C. —2716 K | |
| 31. |
The Statement concerning the relation of temperature to the volume of a gas under fixed pressure was first synthesized by? |
| A. | Avogadro |
| B. | John Dalton |
| C. | Robert Boyle |
| D. | J. Charles |
| Answer» E. | |
| 32. |
The temperature at which the volume of a gas is theoretically zero, is called? |
| A. | Absolute zero |
| B. | Transition temperature |
| C. | Critical temperature |
| D. | None of the above |
| Answer» B. Transition temperature | |
| 33. |
Condensation is the conversion of? |
| A. | Gaseous state to a liquid state. |
| B. | Solid state to a gaseous state. |
| C. | Gaseous state to a solid state. |
| D. | Liquid state to a solid state. |
| Answer» B. Solid state to a gaseous state. | |
| 34. |
Evaporation takes place at? |
| A. | High temperature |
| B. | Temperature has no effect. |
| C. | Low temperature |
| D. | Any (All) temperature |
| Answer» E. | |
| 35. |
Pressure of the gas is due to _____ of the molecules on the walls of vessel. |
| A. | Collision |
| B. | Repulsion |
| C. | None |
| D. | Attraction |
| Answer» B. Repulsion | |
| 36. |
Boiling point of a liquid ___ with increase in pressure. |
| A. | Increase |
| B. | Decrease |
| C. | None |
| D. | Remains same |
| Answer» D. Remains same | |
| 37. |
The freezing point of water in Fahrenheit scale is? |
| A. | 32°F |
| B. | 312°F |
| C. | 212°F |
| D. | 0°F |
| Answer» B. 312°F | |
| 38. |
Ethyl alcohol(C2H5OH) is more viscous than ether (C2H50C2H5) because? |
| A. | None of above. |
| B. | Small sic of ethyl alcohol. |
| C. | Ethyl alcohol is more polar. |
| D. | H-bonding present in ethyl alcohol |
| Answer» E. | |
| 39. |
The deviation of gases from ideal behavior is due to one of the following reason? |
| A. | No force of attraction between the molecules of gases. |
| B. | Sufficient attractive forces among the molecule. |
| C. | Negligible volume of gas molecules. |
| D. | Low pressure and high temperature.. |
| Answer» C. Negligible volume of gas molecules. | |
| 40. |
The liquids that have stronger intermolecular attraction have ______ viscosity: |
| A. | Greater |
| B. | Lesser |
| Answer» B. Lesser | |
| 41. |
Evaporation is a cooling process because? |
| A. | The molecules with high kinetic energy escape. |
| B. | The molecules with low kinetic energy enters the system. |
| C. | The molecules with low kinetic energy escape. |
| D. | None of them |
| Answer» B. The molecules with low kinetic energy enters the system. | |
| 42. |
—273°C is equal to? |
| A. | 273K |
| B. | OK |
| C. | lOOK |
| D. | 1K |
| Answer» C. lOOK | |
| 43. |
Capillary action of a liquid is due to? |
| A. | Surface tension |
| B. | Vapour pressure |
| C. | Viscosity |
| D. | Pressure |
| Answer» B. Vapour pressure | |
| 44. |
The pressure of moist gas is equal to? |
| A. | Sum of the pressure of dry gas and water vapour |
| B. | None of the above |
| C. | Pressure of dry gas |
| D. | Pressure of water vapours |
| Answer» B. None of the above | |
| 45. |
Force per unit length is called? |
| A. | Pressure |
| B. | Surface tension |
| C. | Density |
| D. | Viscosity |
| Answer» C. Density | |
| 46. |
Rate of diffusion of CO & N2 are same at room temperature because? |
| A. | Both are di atomic molecules |
| B. | Both have Tone pair in them |
| C. | Both have same molecular masses |
| D. | Both have multiple bonds |
| Answer» D. Both have multiple bonds | |
| 47. |
H2 is prepared in the laboratory and is collected over water. The pressure of the gas is 745 ton. The pressure of water vapour is 24torr. The pressure of the dry gas is? |
| A. | 721 torr |
| B. | 760 torr |
| C. | 745 torr |
| D. | 766 torr |
| Answer» B. 760 torr | |
| 48. |
The actual pressure on the walls of the container for ideal gas is always less than observed pressure. This is due to the reason that? |
| A. | Collisions are random |
| B. | No attractive forces between the molecules |
| C. | Collisions are perfectly elastic |
| D. | Molecules of gas attracts each other |
| Answer» E. | |
| 49. |
Viscosity is expressed in? |
| A. | Pascal's |
| B. | Poises |
| C. | atm |
| D. | Nm-2 |
| Answer» C. atm | |
| 50. |
Viscosity___ with rise in temperature: |
| A. | None of the above |
| B. | Increases |
| C. | Decreases |
| D. | Remain same |
| Answer» D. Remain same | |